Finding the Fourth Proportional to 400,171.08, 552,436.56 and 309,321.48

Step by Step Solution

1. Step 1: Write the proportion equation
   400,171.08 : 552,436.56 = 309,321.48 : x
2. Step 2: Convert to fraction form
   400,171.08/552,436.56 = 309,321.48/x
3. Step 3: Cross multiply
   400,171.08x = 552,436.56 × 309,321.48
4. Step 4: Simplify right side
   400,171.08x = 170,880,494,345.31
5. Step 5: Solve for x
   x = 170,880,494,345.31/400,171.08
6. Step 6: Final answer
   x = 427,018.60